Well, I suppose it depends on what you define as “perfect”. I don’t think you could easily achieve a flat/even polish using a Dremel in that way, and the photos posted above show why. You could possibly buff, but in this case significant material needs to be cut, assuming the intention is to remove the printed text.
I do own the same Dremel as shown above, but I always mount cases and case backs on a lathe to get results which I would expect from a watch leaving the factory.
If you suspect low torque from the barrel, you can add manual power to the train at the barrel or any wheel you got access to, just grab the spoke of center wheel and gently assisst it turning. It will quite cooperating if you push hard.
I always remove the end stones to check and clean the underneath, rinse lube and screw back on( always soak the cock assembly overnight so the two little screws unscrew easier and you eliminate the risk of ruining em.
+140s/d might indicate only ocasional intermitant touching of HS.